The GUIShell project is a collection of utilities facilitating the use of the GTK+ toolkit in shell scripts through the gtkshell utility. The ACE configuration environment provides sample scripts utilizing gtkshell for desktop utilities. rootcat provides the ability to display messages to the root window using Xft, allowing one to write status display scripts.

Glossword is a system to publish dictionaries,
glossaries, and encyclopedias. It features an
installation wizard, support for multiple
languages, visual themes, multi-domain
installation, an administrative interface with
multi-user support, built-in search and cache
engines, the ability to export/import dictionaries
in XML format, and W3C-validated code. Glossword
is useful for any sort of dictionary-like content,
including sites with game cheat codes, online
translators, references, and various kinds of CMS
solutions.

PyPanel is a lightweight panel/taskbar written in Python and C for X11 window managers. It can be easily customized to match any desktop theme or taste. It works with WindowMaker and EWMH-compliant WMs (Kahakai, Openbox, FVWM, PekWM, etc).

XWidglets is a complete rich Java Swing tool for designing, creating, and using XML-based GUIs. It provides a lightweight XML client, clear separation between view, data, and process, MVC I and II support, event management, a consistent
look and feel across platforms, a rich set of GUI components, and n-tier architecture integration.

BitRock InstallBuilder allows you to create
easy-to-use multiplatform installers for Linux
(x86/PPC/s390/x86_64/Itanium), Windows, Mac OS X, FreeBSD, OpenBSD, Solaris (x86/Sparc), IRIX, AIX, and HP-UX applications. The generated application installers have a native look-and-feel and no external dependencies, and can be run in GUI, text, and unattended modes. In addition to self-contained installers, the installation tool is also able to generate standalone RPM packages.